The key to dealing with indoor pests is prevention. Pests generally enter buildings in search of food, water and shelter - so if you reduce or eliminate the availability of these elements, and make efforts to reduce access points into your home, you will go a long way in dealing with indoor pests.
General pest prevention measures include:
If these measures do not deal with the problem, then look into more specific
information on the pest you are dealing with (see websites below). But make
sure from the outset that what you are dealing with is in fact a pest! For example,
you may not like having spiders in your home, but they are in fact doing you
a service by preying on other insects!
Beyond
Pesticides (click on "Info Services - Alternatives Factsheets")
NCAP
Alternatives Factsheets